Hussain was found dead some 100 metres away on Danforth Avenue, leaving a trail of bullets behind him. Reese Fallon, 18, and 10-year-old Julianna Kozis were gunned in his rampage. Some of the wounded, authorities say, have life-altering injuries.

Meanwhile, a second police source told CBC News that investigators located a high-capacity magazine and a large quantity of ammunition for an assault-style rifle while searchingHussain's apartment in the Thorncliffe Park neighbourhood. Both sources spoke on condition of anonymity because they were not authorized to discuss the investigation.

That source said Hussain was not known to be a gang member.

Video posted on social media showed Hussain clad in black, firing at least three shots into a cafe or restaurant. (@ArielAnise/Twitter)

Body released to family

But the first police source earlier alleged that Hussain's 31-year-old brother, who has been in hospital in a coma for upwards of a year, has ties to a Thorncliffe Park gang, which might explain how he obtained a firearm.

A police source earlier told CBC News that Hussain's prior contact with authorities had involved mental health problems. Hussain did not have a criminal record and his prior contact with police did not involve a risk to public safety, according to a Toronto Police Service spokesperson.

The revelations come one day after a post-mortem examination on Hussain, though the SIU declined to comment on its results, citing the ongoing investigation.

Hussain's body was released to his family on Tuesday, an SIU spokesperson told CBC News in a statement. His body was buried on Wednesday, a source close to the family said.

The Canadian Council of Imams echoed that sentiment in a statement Tuesday:

"While we await the full investigation by the Toronto Police Services, this is certainly a cause for all of us to make mental health a priority in our communities to help avoid terrible tragedies like this from ever happening again," it said.

"This senseless and unspeakable act of violence has no place in our society."